A Houston police officer accused of sexually assaulting a woman while on duty has been implicated in five other possible cases, prosecutors said Tuesday.

Abraham Joseph, 27, was indicted last week on charges of aggravated sexual assault. The allegations stem from an alleged attack on Jan. 2 in which Joseph is accused of handcuffing a cantina waitress outside of the bar, taking her to a dark area and raping her on the trunk of his police car, according to a civil lawsuit filed by the woman.

In court, Assistant Harris County District Attorney Eric Bily said investigators questioned people in the area and turned up leads on as many as four other women reporting five other possible sexual assaults. He declined to comment further, saying authorities are still investigating.